EDD51323DBH-LS
Extended Mode Register
The extended mode register is as follows;
Reserved
Driver Strength
: A12 through A7, A4, A3
: A6 through A5
Partial Array Self-Refresh
: A2 through A0
Following extended mode register programming, no command can be issued before at least 2 clocks have elapsed.
Driver Strength
By setting specific parameter on A6 and A5, driving capability of data output drivers is selected.
Auto Temperature Compensated Self-Refresh (ATCSR)
The DDR Mobile RAM automatically changes the self-refresh cycle by on die temperature sensor. No extended
mode register program is required. Manual TCSR (Temperature Compensated Self-Refresh) is not implemented.
Partial Array Self-Refresh
Memory array size to be refreshed during self-refresh operation is programmable in order to reduce power. Data
outside the defined area will not be retained during self-refresh.
Deep Power-Down Exit Sequence
In order to exit from the deep power-down mode and enter into the idle mode, the following sequence is needed,
which is similar to the power-on sequence.
(1) A 200µs or longer pause must precede any command other than ignore command (DESL).
(2) After the pause, all banks must be precharged using the precharge command (the precharge all banks command
is convenient).
(3) Once the precharge is completed and the minimum tRP is satisfied, two or more Auto-refresh must be performed.
(4) Both the mode register and the extended mode register must be programmed. After the mode register set cycle
or the extended mode register set cycle, tMRD (2 clocks minimum) pause must be satisfied.
Remarks:
1
The sequence of Auto-refresh, mode register programming and extended mode register programming above may
be transposed.
2
CKE must be held high.
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
PASR
1
0
0
0
0
0
0
0
DS
0
0
Refresh Array
All banks
A6 A5 Driver Strength
A2 A1 A0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0
1
1
0
1
0
1
Normal
1/2 strength
1/4 strength
1/8 strength
Bank0 & Bank1 (BA1 = 0)
Bank0 (BA = BA1 = 0)
Reserved
Reserved
Reserved
Reserved
Reserved
Extended Mode Register Set
Preliminary Data Sheet E1432E20 (Ver. 2.0)
24
ELPIDA [ ELPIDA MEMORY ]
